Malicious PDF — malware analysis report

Static analysis result for SHA-256 0724d71f9248c944…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 16:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 271390b810e6c544b347f6d306890abb SHA-1: b1ebeeaca4d19f6890770a1c18e91059a39f52cd SHA-256: 0724d71f9248c9440cb61b695ff374363aa13316a031ba810f92fc0839bdbbd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely intended to redirect users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7609512722---detatokalir.pdf
    • https://mariellatriolo.it/public/file/tujiresi.pdf
    • http://adamlegal.com/userfiles/file/87408957692.pdf
    • https://dijitalsanat.link/upload/files/sobanerimawar.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2883b1f94---bowisunopurugegibexaxamod.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b3c8ebd09---80273137189.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5028pkmoulkkcn9iql8m8cn1g7/lobukatuf.pdf
    • http://rapabzenec.cz/obrazky/files/96570383528.pdf
    • https://autopratichesas.it/file/44013685552.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607649db253d7---9035201469.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9e57250c---roxopiv.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/44960269219.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/53c50c8138e5e786044b8d965433e2d9/wexuso.pdf
    • http://purofirstli.net/userfiles/file/lazuzitisoju.pdf
    • http://iziusb.com/userfiles//file/bisivezelijafafifasut.pdf
    • https://gruntbudowa.pl/files/file/robizanil.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c999d3305---90321863482.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5025a64c0---51850669182.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8f1318698df239737f8f8b4fe2267b31/84000631002.pdf
    • http://nadiadsa.org/userfiles/file/59993470665.pdf
    • https://addsfly.com/userfiles/file/dewalopurexebu.pdf
    • https://midasspa.com/ckfinder/userfiles/files/98693705123.pdf
    • https://leosservices.com/userfiles/file/23903077154.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=drought+causes+and+effects+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0657484cee0aedca0b43949a49a1d787/12566570950.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee16.bin
ea5be8088e4a15b0360b0428966f0546bf4a571762945964e3350df7f5dde854
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 10860 bytes
font_01_sfnt_off000106f4.bin
f78b150e62a5a58bd1c044c6cf92d30ede2d7e47618fe86048904f7ccaaa8b08
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 15964 bytes
font_02_sfnt_off00013004.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13004 16792 bytes